大岗山水电站拱坝建基岩体波速曲线类型及地质背景.docx

第32卷第5期Vol.32No.5

第32卷第5期Vol.32No.5

2012年10月Oct.2012

AdvancesinScienceandTechnologyofWaterResources

DOI:10.3880/j.issn.1006-7647.2012.05.018

大岗山水电站拱坝建基岩体波速曲线类型及地质背景

赵勇1,许模1,赵红梅，徐敬武2,邓忠文2,朱可俊2

(1.成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都610059;

2.中国水电顾问集团成都勘测设计研究院，四川成都610072)

摘要：在介绍大岗山水电站建基岩体的波速测试成果的基础上，总结归纳出建基岩体变模检测孔波速测试曲线的3种类型，即阶梯上升状曲线、波状曲线和近直线状曲线，分析各波速曲线的形成机制及每种波速曲线所代表的地质背景。分析波速测试结果普遍较低的原因，认为大岗山水电站拱坝建基岩体整体性状欠佳主要受诱因(建基面上部岩体以及岩体内部洞室的开挖卸荷作用)和内因(岩体结构特征)的综合作用，二者相辅相成，共同导致岩体松弛。

关键词：建基岩体；波速测试；岩体波速曲线；岩体松弛；地质背景；大岗山水电站

中图分类号：TU452文献标志码：A文章编号：1006-7647(2012)05-0074-04

CurvestylesofwavevelocityandgeologicsettinginfoundationrockmassofarchdamofDagangshanHydropowerStation//ZHAOYong,XUMo,ZHAOHongmei1,XUJingwu2,DENGZhongwen2,ZHUKejun2(1.SateKeyLaboratory

ofGeoharzardsPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059,China;2.ChengduHydroelectricInvestigationandDesignInstitute,HydropowerConsultingGroup,Chengdu610072,China)

Abstract:ThetestresultsofwavevelocityoffoundationrockinDagangshanHydropowerStationareintroduced.Thecurvesofwavevelocityofdeformationmodulustestholesinthefoundationrockareclassifiedintothrecategories:ladder-upshapecurve,undulatingcurveandnearlystraight-linecurve.Theformingmechanismofeachwavevelocitycurveaswellasthegeologicsetingrepresentedbyitisanalyzed.Thecausesforcommonlylowresultsofwavevelocityareinvestigated.ItisconcludedthatthepoorintegrityofthefoundationrockmassofarchdamofDagangshanHydropowerStationisresultedfromtwofactors,thatis,theincentive-excavationunloadingeffectofupperrockmassandinnercaverns,andtheinternalfactorsofstructuralpropertiesofrockmass.Theyarecorrelatedandcausetherelaxationofrockmasstogether

Keywords:foundationrock;wavevelocitytest;velocitycurve;rockmassrelaxation;geologicsetting;DagangshanHydropowerStation

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